Cheap flights from Seattle to Ontario (SEA - ONT)

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The best prices from Seattle/Tacoma Intl to Ontario are usually found in July or January, booked 33 days in advance, depart on a Wednesday or Tuesday and return on a Wednesday

How to find the cheapest flight from
Seattle (SEA) to Ontario (ONT)

All the information you need to plan the best SEA to ONT flight in 2021: compare Seattle to Ontario flight prices with the expected peak season, weather and rainfall in Ontario.
SEA - ONT
Price
$176 - $271
ONT
Temperature
53.6 - 78.8 °F
ONT
Precipitation
0.1 - 3.4 inches

Popular in

December

High demand for flights, 24% potential price rise

Cheapest in

July

Best time to find cheap flights, 15% potential price drop

Round-trip from

$176

From Seattle/Tacoma Intl to Ontario

One-way from

$79

One-way flight from Seattle/Tacoma Intl to Ontario

Flight route prices based on searches on Cheapflights within the last 3 days, monthly prices based on aggregated historical data.
What is the cheapest day to fly round-trip from Seattle to Ontario?

Flying to your destination on a Saturday can be more expensive, but this shouldn’t discourage you from finding affordable options to get to Ontario. Check prices with Cheapflights to find a great deal for your trip.

How far in advance should I book a flight from Seattle to Ontario?

Users have found that booking a flight from Seattle to Ontario at least 59 days early can save you up to 100% on average compared to booking a flight this week. If booking 59 days before your flight isn’t an option for you, users have found flights from Seattle to Ontario for as little as $246 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $359 for flights departing within the next 3 days.

What is the cheapest month to fly from Seattle to Ontario?

Flights from Seattle to Ontario lean towards being more expensive in December. Prices are generally better when you fly from Seattle to Ontario in May, with the cheapest ticket starting at $103.

When is the cheapest time to fly from Seattle to Ontario (SEA - ONT)?

A simple way to save on the total cost of your ticket is to fly from Seattle to Ontario in the afternoon. If you’re flexible enough to do this you can expect to save up to 30% on your trip compared to booking a flight at noon.

Cheap flights from Seattle to Ontario in September, October 2021

The best prices found for SEA to ONT flights for September, October
27 Oct - 2 Nov
$94pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
6 Oct - 11 Oct
$99pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
13 Oct - 18 Oct
$103pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle/Tacoma Intl to Ontario 2021 flight deals

Cheap flights to Ontario from Seattle found for this year
27 Oct - 2 Nov
$94pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
6 Oct - 11 Oct
$99pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
13 Oct - 18 Oct
$103pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to Ontario from Seattle

Save time with Seattle to Ontario direct flight deals
8 Nov - 14 Nov
$115pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
7 Nov - 8 Nov
$118pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
16 Oct - 19 Oct
$119pp
SEA
Seattle/Tacoma Intl
Alaska Airlines
Non-Stop
ONT
Ontario
ONT
Ontario
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Ontario

Late deals on round-trip flights to Ontario from Seattle, departing today and this week
6 Oct - 11 Oct
$99pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
6 Oct - 11 Oct
$106pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
7 Oct - 11 Oct
$122pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ONT
Ontario
ONT
Ontario
Multiple Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

One-way flights to Ontario from Seattle

The cheapest one-way flights from Seattle to Ontario
3:38 am - 6:20 am
Delta
Nonstop
2h 42m
SEA - ONT
Delta
$79
Delta
1:00 am - 3:35 am
Alaska Airlines
Nonstop
2h 35m
SEA - ONT
Alaska Airlines
$80
mytrip.com
1:48 am - 8:24 am
American Airlines
1 Stop
6h 36m
SEA - ONT
American Airlines

Related info for your journey

Useful info, stats and facts about <span class="emphasized">Seattle</span> to <span class="emphasized">Ontario</span> flights.

Flight FAQs

From Seattle to Ontario

What airports do I use to fly from Seattle to Ontario?

Booking a flight from Seattle/Tacoma Intl (SEA) to Ontario (ONT) is your only option if you wish to fly from Seattle to Ontario. On a typical day, there are 10 flights from Seattle/Tacoma Intl to Ontario, all of which are around 2h 25m for a nonstop flight. You can also purchase a plane ticket from 9 airlines when you book a flight from Seattle/Tacoma Intl to Ontario.

Which airlines flying from Seattle/Tacoma Intl to Ontario have flexible cancellations due to COVID-19?

Due to the rapidly changing circumstances due to COVID-19, airlines like Alaska Airlines, United Airlines, and Delta flying from Seattle/Tacoma Intl to Ontario have implemented new flexible cancellation policies.

Are flight prices decreasing from Seattle to Ontario due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Seattle and Ontario for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Can I find flights from Seattle to Ontario for under $100 on Cheapflights?

Yes, there are multiple flights from Seattle to Ontario for under $100. The cheapest flight booked recently is on Multiple Airlines for just $94, but on average you can expect to pay $115.

Are there nonstop flights from Seattle to Ontario for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to Ontario under $200. A good price for a nonstop flight from Seattle to Ontario is less than $143.

Are there last-minute flights available from Seattle to Ontario for under $100?

There are currently 20+ open flights from Seattle to Ontario within the next 7 days for less than $100.

How popular is this Seattle to Ontario flight route?

This flight path from Seattle/Tacoma Intl to Ontario was viewed by 170 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What are the cheapest airlines flying from Seattle to Ontario round-trip?

Our cheapest airline available from Seattle to Ontario is Frontier. Our recent data shows that you can find tickets from as low as $104 on this airline. An additional option worth looking into is Alaska Airlines, starting at $118. Frontier is priced at 49% lower than the current average price of a flight leaving 3 months from now.

What are the cheapest airlines to fly from Seattle to Ontario one-way?

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $45. Users have also found prices from $48 and $78 on Alaska Airlines and Delta, respectively.

What are the most reliable airlines from Seattle to Ontario?

Before booking your flight to Ontario from Seattle, check out the most reliable airlines to get you to your destination on time: Virgin Atlantic (100%), KLM (95%), SkyWest Airlines( 92%).

What are the most popular airlines that fly from Seattle to Ontario?

Major Airline, American Airlines and Alaska Airlines are the most popular airlines when flying from Seattle to Ontario.

What are the cheapest flights from Seattle to Ontario?

Looking at all options, your cheapest flight can be booked for $78. While the most popular route (Seattle/Tacoma Intl - Ontario) can be booked for $119 on average our data indicates $454 when flying from Seattle to Ontario

COVID Restrictions

View COVID Travel Restrictions for Ontario, CA

Do I need a COVID test to fly to Ontario from Seattle?

Information is based on travel restrictions for travel to Ontario within the United States

Most visitors from Seattle/Tacoma Intl need to provide a negative COVID-19 test result and/or quarantine to enter Ontario.

COVID-19 testing requirements
Visitors from Seattle/Tacoma Intl must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Ontario.

Quarantine requirements
Visitors from Seattle/Tacoma Intl are not required to quarantine after entering Ontario.

Do I need a test to fly back to Seattle from Ontario?

Returning to Seattle/Tacoma Intl from Ontario

COVID-19 testing requirements
Visitors from Ontario must present a negative RT-PCR (NAAT) or Antigen (quick-test) test taken 72 hours before departing to Seattle/Tacoma Intl.

Quarantine requirements
Visitors from Ontario are not required to quarantine after entering Seattle/Tacoma Intl.

Hide COVID Travel Restrictions for Ontario, CA

Alternative routes for Seattle to Ontario

See prices for flight routes from nearby airports that may be better suited for you.

Destination information for Ontario

Things to know before you go - useful duration and weather info for your trip from Seattle to Ontario.
Flight duration from SEA to ONT
2h 38m

Airports servicing Seattle

Airports servicing Ontario

Top 8 airlines flying from Seattle/Tacoma Intl to Ontario

The chart below displays the airlines Cheapflights users traveling from Seattle to Ontario choose most often. Cheapest and average prices are based on aggregated data from the past 12 months.
Airline Cheapest Average Flexibility On-time COVID-19 safety
United Airlines
$77 $229 No cancel fee 69%
Delta
$87 $208 No cancel fee N/A
Alaska Airlines
$88 $242 No cancel fee 75%
Spirit Airlines
$91 $162 No cancel fee 65%
JetBlue
$95 $208 No cancel fee 62%
American Airlines
$97 $290 No cancel fee 71%
Frontier
$106 $220 No cancel fee 62%
Southwest
$258 $360 No cancel fee 63%

Hourly flight availability from Seattle to Ontario

See what time of day planes typically take off from Seattle towards Ontario.
Afternoon Noon to 6 PM 44% of SEA to ONT departures
Morning 6 AM to noon 28% of SEA to ONT departures
Evening 6 PM to midnight 19% of SEA to ONT departures
Early morning Midnight to 6 AM 9% of SEA to ONT departures
Midnight
6 AM
Noon
6 PM
Weekly flight availability
from Seattle to Ontario
See how many times per day planes take to the skies headed from Seattle to Ontario.
Sunday
11 daily flights
Monday
13 daily flights
Tuesday
9 daily flights
Wednesday
7 daily flights
Thursday
13 daily flights
Friday
12 daily flights
Saturday
10 daily flights
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